5-54 Accessory Troubleshooting
TP-5672 11/95
Manual Operation Switches
Description of the Manual
Operation Switches
The accessory DD-29 allows manual operation of the
transferswitch.DD-29includes anoverridecircuitwhich
will causethe transferswitch toautomatically transferto
thealternatepower sourceif theconnectedsourcefails.
See Figure 5-61 to Figure 5-64 for wiring diagrams for
this option.
D DD-29-P. Momentary contact buttons for manual
transfer in both directions.
D DD-29-R. Momentary contact key-operated
switches for manual transfer in both directions.
D DD-29-S. A momentary contact button for
manual transfer from emergency to normal.
D DD-29-T. A momentary contact key-operated
switch for manual transfer from emergency to
normal.
D DD-29-U. Momentary contact buttons formanual
transferinbothdirectionsandanAutomatic/Manual
selector switch.
D DD-29-V. A momentary contact key-operated
switch for manualtransferin bothdirections andan
Automatic/Manual selector switch.
D DD-29-W. A momentary contact button for
manual transfer from emergency to normal and an
Automatic/Manual selector switch.
D DD-29-X. A key-operated switch for manual
transfer from emergency to normal and an
Automatic/Manual selector switch.
D DD-29-Y. A Pushbutton switch for manual
transfer from emergency or normal to off position.
Troubleshooting the Standard Power
Conversion Unit
Automatic-Transfer/Manual-Transfer
Switch
If the Automatic-Transfer/Manual-Transfer switch is in
the Manual position, the following events will occur.
When the normal source fails:
1. The Source-Available, Normal LED turns off.
2. The Time-Delay, Engine-Start-On LED illuminates
indicating the engine start time delay is timing.
3. TheTime-Delay, Engine-Start-EndLEDilluminates
indicating the engine has been signaled to start.
4. The Source-Available, Emergency LED turns on.
5. The System-Status, System-Alert LED flashes.
6. The LCD displays the MANUAL TRANSFER
message. Push the Manual Transfer-To-
Emergency Pushbutton. The contactor transfersto
the emergency position. The Contactor-Position,
Normal LED turns off, and the Contactor-Position,
Emergency LED turns on. If the Manual Override
jumper is installed the transfer will occur
automatically.
When the normal source returns:
1. The Source-Available, Normal LED illuminates.
2. The Time-Delay, Emergency-To-Normal-On LED
illuminates indicating the emergency-to-normal
time delay is timing.
3. The Time-Delay, Emergency-To-Normal-End LED
illuminates indicating the time delay has completed
timing.
4. TheSystem-Status, System-Alert LED flashesand
the LCD shows the MANUAL TRANSFER
message.
5. Push the Manual-Transfer-To-Normal Pushbutton.
The contactor transfers to the normal position.
6. The Time-Delay, Engine-Cooldown-On LED
illuminates showing that the generator set engine
cooldown timer is timing.
7. The Time-Delay, Engine-Cooldown-End LED
illuminatesmomentarilyastheengineis signaledto
shut down.
8. The Source-Available, Emergency LED turns off.
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